1 #include "940shared.h"
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3 static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
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4 static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
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5 static unsigned char *mp3_data = (unsigned char *) 0x01000000;
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10 void spend_cycles(int c);
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11 void cache_clean(void);
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12 void cache_clean_flush(void);
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13 // this should help to resolve race confition where shared var
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14 // is changed by other core just before we update it
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15 void set_if_not_changed(int *val, int oldval, int newval);
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17 // asm volatile ("mov r0, #0" ::: "r0");
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18 // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
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19 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
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22 static void mp3_decode(void)
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24 int mp3_offs = shared_ctl->mp3_offs;
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25 unsigned char *readPtr = mp3_data + mp3_offs;
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26 int bytesLeft = shared_ctl->mp3_len - mp3_offs;
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27 int offset; // frame offset from readPtr
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30 if (bytesLeft <= 0) return; // EOF, nothing to do
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32 offset = MP3FindSyncWord(readPtr, bytesLeft);
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34 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
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38 bytesLeft -= offset;
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40 err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,
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41 shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);
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43 if (err == ERR_MP3_INDATA_UNDERFLOW) {
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44 shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF
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45 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
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47 } else if (err <= -6 && err >= -12) {
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48 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
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49 // just try to skip the offending frame..
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52 shared_ctl->mp3_errors++;
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53 shared_ctl->mp3_lasterr = err;
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55 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);
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59 void Main940(int startvector, int pc_at_irq)
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61 int mix_buffer = shared_data->mix_buffer;
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62 ym2612_940 = &shared_data->ym2612;
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65 shared_ctl->vstarts[startvector]++;
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66 shared_ctl->last_irq_pc = pc_at_irq;
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67 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");
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74 while (!shared_ctl->busy)
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76 //shared_ctl->waitc++;
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77 spend_cycles(8*1024);
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81 if (!shared_ctl->busy)
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85 shared_ctl->lastbusy = shared_ctl->busy;
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88 for (job_num = 0; job_num < MAX_940JOBS; job_num++)
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90 shared_ctl->lastjob = (job_num << 8) | shared_ctl->jobs[job_num];
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92 switch (shared_ctl->jobs[job_num])
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94 case JOB940_INITALL:
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96 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
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97 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);
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98 /* Helix mp3 decoder */
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99 shared_data->mp3dec = MP3InitDecoder();
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102 case JOB940_YM2612RESETCHIP:
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103 YM2612ResetChip_();
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106 case JOB940_PICOSTATELOAD:
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107 YM2612PicoStateLoad_();
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110 case JOB940_YM2612UPDATEONE: {
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112 if (shared_ctl->writebuffsel == 1) {
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113 wbuff = (int *) shared_ctl->writebuff1;
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115 wbuff = (int *) shared_ctl->writebuff0;
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118 /* playback all writes */
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119 for (i = 2048/2; i > 0; i--) {
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123 if (d == 0xffff) break;
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124 YM2612Write_(d >> 8, d);
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126 if (d == 0xffff) break;
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127 YM2612Write_(d >> 8, d);
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130 YM2612UpdateOne_(mix_buffer, shared_ctl->length, shared_ctl->stereo, 1);
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134 case JOB940_MP3DECODE:
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141 // asm volatile ("mov r0, #0" ::: "r0");
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142 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */
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143 // cache_clean_flush();
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145 shared_ctl->loopc++;
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147 // // shared_ctl->busy = 0; // shared mem is not reliable?
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